SMS OTP vs Email OTP & Magic Link
SMS verifies a phone number and works for users without email at hand. Email OTP and Magic Link cost less per login and are on the Free plan - a good default where you already have the user's email.
SMS Authentication: SMS OTP vs Other Methods
SMS OTP gets almost anyone with a phone signed in, with nothing to install. It is also phishable and costs money per message. Here is when to use it, and what to pair it with.
Key Features
Where SMS OTP fits - and where another method on the same API does the job better.
SMS OTP vs Passkeys
Passkeys are phishing-resistant and need no message at all. Use SMS OTP for first sign-up and as the fallback on devices without passkey support.
SMS OTP as a Second Factor
Use an SMS code as a second factor on sensitive actions. Codes can be phished or intercepted, so prefer passkeys where the risk is high.
Fast Delivery
95% of codes delivered in under 3 seconds, minimizing friction during login.
SMS OTP vs WhatsApp OTP & Silent Auth
Where SMS is costly or unreliable, WhatsApp OTP and Mobile Silent Auth (both on Enterprise) verify the same phone number with less friction.
Spam & Bot Prevention
Cut fake sign-ups by verifying a real phone number at registration.
How Phone OTP Login Works
SMS OTP login in three steps:
User Enters Phone Number
The user provides their mobile number during sign-up or login.
OTP is Sent Instantly
A secure one-time passcode is sent to the phone by SMS.
User Verifies Access
The user enters the OTP, and upon validation, gets instant, secure access to the application.
Simple Integration
SMS OTP is one method on the MojoAuth API. Turn it on next to passkeys, magic links and email OTP, and deploy in hours, not months. SMS OTP (Phone OTP) is on Business Pro and Enterprise.
- Deploy in hours, not months
- Customizable authentication flows
- Works globally on any device or network
- Developer-friendly APIs and guides
{ "phone": "+1234567890", "otp": "123456", "method": "sms" }
Benefits of Phone OTP Login
Why businesses and users choose SMS OTP authentication for secure and convenient access.
For Businesses
- Prevent spam and fake registrations
- Use SMS as a passwordless login or as a second factor
- 99.9% uptime SLA on Business Pro, 99.99% on Enterprise
- Mix in cheaper methods (email OTP, magic link, passkeys) to cut SMS spend
For Users
- Fast, secure access without the need to remember passwords
- Convenient login from any mobile device or network
- A smooth, frustration-free experience that builds trust
Works with every other method on the same API
Ready to build? See Phone OTP (SMS), or compare every method on the same API.
See every authentication methodPick the right method for every user
Offer SMS OTP where it fits and passkeys, magic links or email OTP where they fit better - on one API. Deploy in hours, not months.
Call +1-844-321-AUTH